The difference between a two- digit number and the number obtained by interchanging the position of its digits is 36.What is the difference between the two digits of that number?

3
4
9
Cannot be determined

Correct Answer: 4

Explanation:

Let the ten's digits be x and unit's digit be y.
Then,(10x + y) - (10y + x)=36 ⇔9(x-y)=36
⇔ x - y=4

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